As I’ve now come to expect with Be Quiet products the Straight Power E9 delivers on all aspects of Be Quiets attention to detail and determination to build a product which is the best in class.

Although not in their High-End range of products the Straight Power is still a high quality PSU boasting the following features:

World Class Quiet and Efficiency

The Straight PowerTM E9 680W CM provides best-in-class performance for systems that demand whisper-quiet operation without the slightest compromise in power quality. The many premium features our German team has designed into this power supply make the E9 680W CM a ‘Best Choice’ for new systems and as a replacement in existing systems.

• Virtually silent operation achieved through a broad array of meticulous optimizations, including use of custom-designed 135mm SilentWings® Fan
• SilentWings fan features airflow-optimized fan blade, fluid dynamic bearing with copper core and high quality IC motor controller
• 680 Watts of continuous power provide extensive power reserves for those times your PC really needs it all
• Cable management with extra-long cable reach simplifies component installation and reduces annoying clutter, increasing airflow and improving cooling in even the largest PC cases
• 80PLUS Gold certification and up to 93% power conversion efficiency let you do more work with the same power and reduce your power bills
• NVIDIA Hybrid readiness and AMD CrossfireX certification allows you to build powerful Multi-GPU systems with confidence
• German product conception, design and quality control
• Advanced gaming up to Triple-GPU
• Silent PC builds
• Multimedia systems and Home Theatre
• Photo and Video editing desktops

Virtually Silent Operation

• Installed 135mm SilentWings fan includes a wide array of electronic and mechanical optimizations for best-of-class airflow with very low noise production, including:
•  unique airflow-optimized fan blade design reduces noise-generating fan turbulence
• advanced fluid dynamic bearing with copper core provides for greatly reduced operating noise and super-long life
• high quality IC motor controller reduces electrical noise
• SilentWings fan is decoupled from the PSU body with special mounts, reducing transmission of vibration and noise
• Optimized PSU airflow design generates superior cooling at lower fan speeds and reduces turbulence around components, thus allowing even quieter operation
• Variable fan speed is optimally governed to strike the best balance between proper cooling and deep quiet


• All-new integrated circuit power conversion design features Active Clamp and Synchronous Rectifier (SR) technology for amazing signal stability and power efficiency
• Premium quality capacitors rated to 105°C for maximum reliability and operating life
• Full suite of top safety protections defends against over-currents, over- and under-voltages, short circuits, overheating and overloads, thus safeguarding your valuable components
• Four independent +12V rails improve power signal stability

Energy Efficiency

• 80PLUS GOLD certification independently verifies the extremely high operating efficiency (up to 93%) of this design
• High efficiency means money savings, because your PC draws less power from the mains to do its work
• High efficiency also means less waste heat, less cooling required, and overall quieter operation
• Standby drain of less than 0.3 Watts
• Meets Energy Star 5.0 guidelines
• Fulfils ErP 2013 guidelines
• Zero Load design supports Intel’s Deep Power Down C6 mode

Maximum Compatibility and Convenience

• Modular, sleeved cable management system with removable cable bundles simplifies component installation, reduces annoying clutter, increases airflow and allows for improved cooling
• System features 23 connectors for large system builds
• Connectors are compatible with older components as well as those still on the drawing board
• Cable lengths up to 115 cm are perfect for large PC cases
• Individual P4 and P8 plugs support all common mainboard types
• Four PCIe connectors for powerful multi-GPU configurations (NVIDIA SLI Ready, NVIDIA Hybrid and AMD CrossFireX) up to Triple GPUs.
• Clearly labelled plugs and clever accessories promote simple installation

Outstanding Service and Support

  • 5 year manufacturer's warranty

In the video below I'll show you around the product and give you an idea of whats included:

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